An Upstate man has confessed to sexual abuse with a child, according to an incident report from the Spartanburg County Sheriff’s Office.

William Thad Johnson, 45, of Grambling School Road, in Inman, is charged with four counts of criminal sexual conduct with a minor and four counts of engaging a child under 18 for sexual performance.

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Last month, the Spartanburg County Sheriff’s Office said investigators helped the FBI execute a search warrant for child pornography at a previous residence of Johnson’s.

An incident report said that during the search, evidence was found in reference of possible sexual abuse.

As a result of the evidence collected and examined, the Spartanburg County Sheriff’s Office Special Victims Unit began an investigation and identified multiple potential victims, all of whom were referred to the Children’s Advocacy Center for forensic interviews.

One of those victims gave a detailed disclosure against Johnson, and a result, the SVU investigator consulted with the Solicitor’s Office and then a magistrate, who issued the warrants.

The warrants said the crimes happened between Aug. 27, 2007 and Aug. 26, 2012 and the victim was younger than 11 but older than 3.

An incident report said investigators found video evidence of sexual abuse by Johnson.

Johnson was arrested Monday at his workplace and taken to the sheriff’s office,where he confessed to the allegations, sheriff’s office officials said.